Weight of Colbalt (II) Chloride Hexahydrate 5.025g Moles of Cobalt (II) Chloride

Question

Weight of Colbalt (II) Chloride Hexahydrate

5.025g

Moles of Cobalt (II) Chloride Hexahydrate

0.0211mols

Weight of Recovered Product, Filter Paper and Watch Glass

35.54g

Weight of Filter Paper and Watch Glass

35.34g

Experimental Yield of Product

Theoretical Yield of Product

Percent Yield of Product

[Co(H2O)6]2+ + 5NH3 [Co(NH3)5(H2O)]2++5H2O

2 [Co(NH3)5(H2O)]2+ + H202 [Co(NH3)5(OH)]2++2 H2O

[Co(NH3)5(OH)]2+ +3Cl- [Co(NH3)5Cl]Cl2(s) +OH-

Give the information above write an overall balanced equation and calculate the theoretical yield. (please show work)

Weight of Colbalt (II) Chloride Hexahydrate

5.025g

Moles of Cobalt (II) Chloride Hexahydrate

0.0211mols

Weight of Recovered Product, Filter Paper and Watch Glass

35.54g

Weight of Filter Paper and Watch Glass

35.34g

Experimental Yield of Product

Theoretical Yield of Product

Percent Yield of Product

Explanation / Answer

Given reaction:

2 [Co(H2O)6]2+ + 10NH3 -----> 2[Co(NH3)5(H2O)]2++10H2O

2 [Co(NH3)5(H2O)]2+ + H2O2 ---> 2[Co(NH3)5(OH)]2++2 H2O

2 [Co(NH3)5(OH)]2+ +6Cl- ---> 2[Co(NH3)5Cl]Cl2(s) +2 OH-

Summing all the reaction to get overall reaction:

2 [Co(H2O)6]2+ + 10NH3 + 2 [Co(NH3)5(H2O)]2+ + H2O2 + 2 [Co(NH3)5(OH)]2+ +6Cl-   ----> 2[Co(NH3)5(H2O)]2++10H2O + 2[Co(NH3)5(OH)]2++2 H2O + 2[Co(NH3)5Cl]Cl2(s) +2 OH

Cancelling commong compounds on both the sides, we get the overall reaction.
2 [Co(H2O)6]2+ + 10NH3 + H2O2 + 6Cl- ----> 2[Co(NH3)5Cl]Cl2(s) +2 OH- + 12 H2O

Now Equivalents of Cobalt (II) Chloride Hexahydrate = Equivanents of Aquapentaammine Cobalt (II) = Equivalents of pentamminechloro Cobalt (III) = 0.0211 moles ( nfactor here is 1)

Weight of Pentamminechloro Cobalt (III) = 0.0211* Mw of pentamminechloro Cobalt (III) = 0.0211*250.44 = 5.284 gm
Theoretical yield will be 5.284 gm

Now weight of recovered product, filter paper and watch glass = 35.54 gm
Weight of filter paper and watch glass = 35.34 gm

Weight of recovered product = weight of recovered product, filter paper and watch glass - Weight of filter paper and watch glass = 35.54 - 35.34 = 0.20 gm

Percentage yield = 100* 0.20/5.284 = 3.78%

                                                           

Cheers

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